1/*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#if !defined(_LIBC) && !defined(lint)
19static const char rcsid[] = "$Id$";
20#endif
21
22/* Import. */
23
24#include <arpa/nameser.h>
25
26#include <ctype.h>
27#include <errno.h>
28#include <stdio.h>
29#include <string.h>
30#include <time.h>
31
32#define SPRINTF(x) ((size_t)sprintf x)
33
34/* Forward. */
35
36static int datepart(const char *, int, int, int, int *);
37
38/* Public. */
39
40/*%
41 * Convert a date in ASCII into the number of seconds since
42 * 1 January 1970 (GMT assumed). Format is yyyymmddhhmmss, all
43 * digits required, no spaces allowed.
44 */
45
46u_int32_t
47ns_datetosecs(const char *cp, int *errp) {
48 struct tm time;
49 u_int32_t result;
50 int mdays, i;
51 static const int days_per_month[12] =
52 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
53
54 if (strlen(cp) != 14U) {
55 *errp = 1;
56 return (0);
57 }
58 *errp = 0;
59
60 memset(&time, 0, sizeof time);
61 time.tm_year = datepart(cp + 0, 4, 1990, 9999, errp) - 1900;
62 time.tm_mon = datepart(cp + 4, 2, 01, 12, errp) - 1;
63 time.tm_mday = datepart(cp + 6, 2, 01, 31, errp);
64 time.tm_hour = datepart(cp + 8, 2, 00, 23, errp);
65 time.tm_min = datepart(cp + 10, 2, 00, 59, errp);
66 time.tm_sec = datepart(cp + 12, 2, 00, 59, errp);
67 if (*errp) /*%< Any parse errors? */
68 return (0);
69
70 /*
71 * OK, now because timegm() is not available in all environments,
72 * we will do it by hand. Roll up sleeves, curse the gods, begin!
73 */
74
75#define SECS_PER_DAY ((u_int32_t)24*60*60)
76#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
77
78 result = time.tm_sec; /*%< Seconds */
79 result += time.tm_min * 60; /*%< Minutes */
80 result += time.tm_hour * (60*60); /*%< Hours */
81 result += (time.tm_mday - 1) * SECS_PER_DAY; /*%< Days */
82 /* Months are trickier. Look without leaping, then leap */
83 mdays = 0;
84 for (i = 0; i < time.tm_mon; i++)
85 mdays += days_per_month[i];
86 result += mdays * SECS_PER_DAY; /*%< Months */
87 if (time.tm_mon > 1 && isleap(1900+time.tm_year))
88 result += SECS_PER_DAY; /*%< Add leapday for this year */
89 /* First figure years without leapdays, then add them in. */
90 /* The loop is slow, FIXME, but simple and accurate. */
91 result += (time.tm_year - 70) * (SECS_PER_DAY*365); /*%< Years */
92 for (i = 70; i < time.tm_year; i++)
93 if (isleap(1900+i))
94 result += SECS_PER_DAY; /*%< Add leapday for prev year */
95 return (result);
96}
97
98/* Private. */
99
100/*%
101 * Parse part of a date. Set error flag if any error.
102 * Don't reset the flag if there is no error.
103 */
104static int
105datepart(const char *buf, int size, int min, int max, int *errp) {
106 int result = 0;
107 int i;
108
109 for (i = 0; i < size; i++) {
110 if (!isdigit((unsigned char)(buf[i])))
111 *errp = 1;
112 result = (result * 10) + buf[i] - '0';
113 }
114 if (result < min)
115 *errp = 1;
116 if (result > max)
117 *errp = 1;
118 return (result);
119}
120
121/*! \file */
122